package com.zhang.hadoop.netty.netty.websocket;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.stream.ChunkedWriteHandler;
import io.netty.handler.timeout.IdleStateHandler;

/**
 * @author: zhang yufei
 * @createTime:2022/2/20 10:12
 * @description:
 */
public class MyServer {

    public static void main(String[] args) {
        EventLoopGroup boosGroup = new NioEventLoopGroup(1);
        EventLoopGroup workerGroup = new NioEventLoopGroup(8);
        try {
            ServerBootstrap bootstrap = new ServerBootstrap();
            bootstrap.group(boosGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .handler(new LoggingHandler(LogLevel.INFO))//在bossGroup增加一个日志处理器
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel socketChannel) throws Exception {
                            ChannelPipeline pipeline = socketChannel.pipeline();
                            //因为基于http协议,使用http的编码和解码器
                            pipeline.addLast(new HttpServerCodec());
                            //是以块的方式写,添加ChunkedWriteHandler处理器
                            pipeline.addLast(new ChunkedWriteHandler());
                            /**
                             * 1.http数据在传输过程中是分段,HttpObjectAggregator,就是将多个段聚合
                             * 2.这就是为什么,当浏览器发送大量数据是,就会发出多次http请求
                             */
                            pipeline.addLast(new HttpObjectAggregator(8192));
                            /**
                             * 1.对应webSocket,它的数据是以帧(frame)形式传递
                             * 2.可以看到WebSocketFrame,下面有六个子类
                             * 3.浏览器请求时,ws://localhost:7000/hello 表示请求的uri
                             * 4.WebSocketServerProtocolHandler核心功能是将http协议升级为ws协议,保持长连接
                             */
                            pipeline.addLast(new WebSocketServerProtocolHandler("/hello"));
                            //自定义的handler,处理业务逻辑
                            pipeline.addLast(new MyTestWebSocketFrameHandler());
                        }
                    });
            //启动服务器
            System.out.println("netty服务器已启动");
            ChannelFuture channelFuture = bootstrap.bind(8000).sync();
            //监听关闭
            channelFuture.channel().closeFuture().sync();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            boosGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}
